On Saturday, 18 July 2015 at 16:01:25 UTC, Nicholas Wilson wrote:
On Saturday, 18 July 2015 at 13:48:20 UTC, Clayton wrote:
[...]
[...]
change function signature to
int[char] function(string) or as the char type is the index
probably better of as
int[256] function(string). also probably no need to take
pattern by ref as it is effectively struct{ size_t length;
char* ptr;}. also we aren't going to modify it.
int[256] computeAtCompileTime(string pattern)
{
[...]
pattern.length is a size_t no need to change its type in
another variable. you are unlikely to be dealing with string
longer than 2^32 (also signedness) but w/e
int[256] ret; // implicitly initialised to int.init
(i.e. 0)
[...]
can just foreach over pattern
foreach(i, c; pattern)
ret[c] = pattern.length - i -1;
[...]
[...]
if you want this to be not callable at runtime then wrap the
main body (sans variable declaration) with
if (__ctfe)
{
...
}
Thanks Nicholas , I have integrated some of your advice on the
edited code i.e. foreach and ref in pattern . Hope I fully
understood what you meant. Am yet to look whether I still need
to change the signature . I have heared there are two approaches
to this, Where does one really draw the line between CTFE and
Template metaprogramming?
